I inadvertently won a new Wireless IntelliMouse Explorer with Tilt Wheel Technology, the Look and Feel of Leather, and Three Times Longer Battery Life. So I plugged it in. It is actually a really nice mouse. They finally made it so the scroll wheel does not click. I am all about the firm, smooth-rolling scrolling. The sideways scrolling is kind of useless, and I was miffed that I had to install IntelliPoint 5 to get it to work, but I am hoping I will be able to assign some other functionality to the sideways scroll in Halo. I have only had it for two days, so the jury is still out on the battery life. I was also annoyed that the default action for pusing the wheel button was Next App instead of AutoScroll, but that was easy to change in the cpl. The cpl is very pretty.
Overall this is the best mouse I have ever used. I would recommend it.